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Stock-Based Compensation (Details) (Employee Stock Option [Member], USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Employee Stock Option [Member]
Employee service share-based compensation, aggregate disclosures
Compensation expense included in Entergy's Net Income for the third quarter	$ 2.5	$ 3.7	$ 8.0	$ 11.3
Tax benefit recognized in Entergy's Net Income for the third quarter	0.9	1.4	3.1	4.4
Compensation cost capitalized as part of fixed assets and inventory as of September 30,			$ 1.5	$ 2.2

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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